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##### Engineering Science

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**Engineering Science**• Available at National 4, National 5, Higher and Advanced Higher ; • National 4 course – internally assessed, externally verified, ie, NO FORMAL EXAM; • National 5 and above – externally assessed, externally verified; • 4 Course Units (3 at Nat5 and above): • Engineering Contexts & Challenges; • Electronics and Control; • Mechanisms and Structures • Added Value Unit (Course Assessment at Nat5 and above). • Learners have to pass all units to attain the course award.**Course Themes**• The Systems Approach • Systems and subsystem diagrams • Function of a system in terms of input — process — output and feedback loops • Open and closed loop control • Interaction of sub-systems • Energy and Efficiency • Application of the law of conservation of energy • Calculations involving forms of energy (kinetic, potential, electrical, heat) • Energy transfers, losses and transformations in a system • Energy audits and calculation of overall efficiency • Applied calculations involving efficiency, work done and power, using: • Ew=Fd P=E/t, Ek = ½ mv2Ep = mghEe = VIt Eh = cmΔT Efficiency η = Eout/Ein = Pout/Pin**N5 Unit 1 – Engineering Contexts & Challenges**• Engineering Roles and Disciplines • Examples of applications of environmental, civil, structural, mechanical, chemical, electrical and electronic engineering; • Examples of the contribution of branches of engineering to solve engineering challenges that integrate branches of engineering; • The varied roles of engineers in designing, implementing, testing and controlling complex systems. • Impacts of Engineering • Examples of social and economic impacts (positive and negative) of engineering; • Examples of environmental impacts (positive and negative) of engineering; • Ways in which engineering solutions contribute to tackling climate change;**N5 Unit 2 – Electronics and Control**• Analogue Electronic Control Systems • Function and purpose within a circuit of: battery; switch; resistor; variable resistor; LDR; thermistor, LED; diode; motor; lamp; ammeter and voltmeter • Description of function of a circuit in terms of input, process and output • Calculations involving the relationship between voltage, current and resistance (Ohms’ Law) • Calculations involving resistors in series and parallel • Calculations of voltage, current and unknown values in a fixed voltage divider • Design of a voltage divider to provide an input signal for a control circuit • Interpretation of information from given tables for an LDR and a thermistor • Function of a relay and a protection diode in an electronic circuit • Explanation of the switching function of a transistor • The operation of an electronic control circuit which includes a variable voltage divider, transistor, relay and output transducer**N5 Unit 2 – Electronics and Control**• Digital Electronic Control Systems • AND, OR and NOT gates, and combinations with up to three inputs, using truth tables and Boolean expressions description of function of a circuit in terms of input, process and output • Examples of the use of microcontrollers in commercial and industrial applications calculations involving resistors in series and parallel • Advantages and disadvantages of microcontroller-based control systems compared to a hard-wired electronic equivalent design of a voltage divider to provide an input signal for a control circuit • Use of correct symbols (start, stop, input, output, branch, loop) to construct flowcharts showing solutions to simple control programs, involving time delays, continuous and fixed loops • Use of suitable commands, including high, low, for…next, if…then, pause, end (or their equivalents) to construct programs to solve simple control problems, involving time delays, continuous and fixed loops**N5 Unit 3 – Mechanisms and Structures**• Drive Systems • Motion in mechanical systems rotary, linear, reciprocating and oscillating • Simple gear train systems, including idler gears, (diagrams and conventions for representation) • Compound gear trains • Calculation of speed (velocity) ratio of simple and compound gear trains • The effects of friction in drive systems • Appropriate British Standard Symbols • Pneumatics • Symbols and operation of standard pneumatic components (including restrictor, uni-directional restrictor, 5/2 valve and actuators: diaphragm, solenoid) • Pressure decay control circuits • Calculation of relationships between force, pressure and area in single and double acting cylinders • Control of speed and force**N5 Unit 3 – Mechanisms and Structures**• Structures and Forces • Examples of effects of a force • Concurrent forces, equilibrium • Use of triangle of forces and free body diagrams • Non-concurrent forces, parallel forces • Moment of a force • Calculations involving the principle of moments • Balance beam, simply supported beam, reaction forces • Materials • Selection of appropriate material for given application, with justification • Calculation of the relationship between direct stress, force and area • Calculation of strain**How’s it Assessed?**• The Units can be assessed by students either passing the Combined Assessment or by passing individual “Unit by Unit” Assessments; • Learners then have to complete the Course Assessment.**Course Award (150 Marks, Graded A – D)**• Exam • 90 Marks • 90 Minutes • 20 - 30% Marks Relating Unit 1 • 30 - 40% Marks Each Relating to Units 2 and 3 • Pupils will have a Data Booklet to refer to • Section 1 (20 Marks) – Short Answer Questions • Section 2 (70 Marks) – Extended Response Questions**Course Award (150 Marks, Graded A – D)**• Course Assessment • 60 Marks • The assignment should clearly demonstrate application of knowledge and skills, at an appropriate level, from both the Mechanisms and Structures and Electronics and Control Units. • Guidelines for the assignment will include a list of questions/tasks/prompts which will lead learners through the task in clear stages. • Marks will be awarded for: • Analysing the problem (10 Marks) • Designing a solution (10 Marks) • Constructing/simulating a solution (20 Marks) • Testing the solution (10 Marks) • Reporting on the solution (10 Marks) • Evidence should include;the completed solution, a record of progress through the assignment (such as an informal electronic log or diary maintained by the learner), a short report on the testing of the solution (in written, electronic and/or oral form)**Course Award (150 Marks, Graded A – D)**• Setting, Conducting and Marking of Assessment Question paper • This question paper will be set and marked by SQA, and conducted in centres under conditions specified for external examinations by SQA. • Controlled Assessment — Assignment • The assignment is: • Set by SQA • Conducted under some supervision and control Evidence will be internally marked by centre staff in line with SQA marking instructions. • All marking will be quality assured by SQA. • A bank of assignments will be provided, and there will be choice from this bank.